[PATCH v2] staging: fbtft: fb_tinylcd: replace udelay() with fsleep()

From: Tomasz Unger <redacted>

fsleep() is the preferred modern API for flexible sleeping as it
automatically selects the best sleep mechanism based on the duration.
Replace udelay() with fsleep() to improve power efficiency.

init_display() is a driver initialization callback which runs in
sleeping context, so fsleep() is safe to use here.

Signed-off-by: Tomasz Unger <redacted>
---
Changes in v2:
- Added sleeping context justification to commit message
- Replaced usleep_range() with fsleep() as suggested by Andy Shevchenko 

 drivers/staging/fbtft/fb_tinylcd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/fbtft/fb_tinylcd.c b/drivers/staging/fbtft/fb_tinylcd.c
index 9469248f2c50..3fb15df31592 100644
--- a/drivers/staging/fbtft/fb_tinylcd.c
+++ b/drivers/staging/fbtft/fb_tinylcd.c

@@ -41,7 +41,7 @@ static int init_display(struct fbtft_par *par)
 		       0x00, 0x35, 0x33, 0x00, 0x00, 0x00);
 	write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
 	write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
-	udelay(250);
+	fsleep(250);
 	write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
 
 	return 0;

-- 
2.53.0